On this day: January 10

Caesar crosses the Rubicon, the London Underground opens, RCA introduces the 45 rpm single, The Beatles' first U.S. record is released, and Wendy's asks "Where's the Beef?," all on this day.

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PBS

1971: "Masterpiece Theatre" premieres on PBS. The anthology series, which presents acclaimed British productions, remains in production today, renamed "Masterpiece," making it America's longest-running weekly prime time drama series.

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